Neco Model Questions Vol1 2025 Biology Question 36

Practice objective / multiple choice question 36 from the 2025 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2025 Biology Objective / Multiple Choice Medium Difficulty
Question 36 NECO_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • objective

In a test cross, a heterozygous plant \(AaBb\) is crossed with a homozygous recessive plant \(aabb\). From a total of 2000 offspring, the phenotypic counts are: 880 with phenotype AB, 860 with phenotype ab, 130 with phenotype Ab, and 130 with phenotype aB. (i) Calculate the recombination frequency and the map distance between the A and B genes. (ii) If the two genes were assorting independently, what phenotypic ratio would be expected among the progeny of this test cross? (iii) Based on the data, are the genes linked? Justify your answer.

Answer Options

Correct Answer A. Recombination frequency = 13 %; map distance ≈13 cM; genes are linked (frequency <50 %).
B. Recombination frequency = 25 %; map distance ≈25 cM; genes are linked (frequency <50 %).
C. Recombination frequency = 13 %; map distance ≈13 cM; genes are not linked (frequency ≥50 %).
D. Recombination frequency = 40 %; map distance ≈40 cM; genes are linked (frequency <50 %).
Correct Answer
A
Correct Option:
Recombination frequency = 13 %; map distance ≈13 cM; genes are linked (frequency <50 %).

About This Question

This is Neco Model Questions Vol1 2025 Biology Question 36. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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